The field of electromagnetic interference (EMI) initially gained formal recognition quietly in 1933 under a sub-committee of the International Electrotechnical Commission (IEC) in Paris. Under the name of CISPR (International Special Committee on Radio Interference), the sub-committee was created to better understand the long-term complications that could arise from radio frequency technology. From its founding in 1820 by Morse, Henry, and Vail, radio’s popularity had exploded, becoming the must-have household appliance during the Depression. It was soon determined that intentional and unintentional RF transmissions began affecting other electrical systems, leading to a growing awareness of EMI within the electronics community. In 1934, CISPR began creating and distributing requirements regarding the recommended allowable emissions and immunity limits for electronic devices, which evolved into much of the world’s current EMC regulations.

Figure 1: Multiple filter types designed to negate EMI in a system

Throughout the 1960s, 1970s and 1980s, researchers became increasingly alarmed about increased interference from electromagnetic emissions. In 1967, the U.S. military issued Mil Standard 461A, which established testing and verification requirements for electronic devices already in use in military applications, as well as emissions and susceptibility limits for new military electronic equipment.

In 1979, the U.S. Federal Communications Commission (FCC) imposed legal limits on electromagnetic emissions for all digital equipment in the U.S. As systems have become faster, smaller, and more powerful, these regulations have continued to evolve by necessity, as emerging technologies display a greater propensity to interfere with the operations of other electrical systems.

Read the complete article on InCompliance Mag’s website…
A Basic Overview of RF/EMI Filters and Filtered Connectors | In Compliance Magazine

About EMI Solutions

Since its founding in 1996, EMI Solutions has emerged as the leading woman owned small business devoted to manufacturing 100% tested, American made filtering products. Over that time span, EMI Solutions has developed innovative filtering products, including our proprietary FlexFilter line of high reliability connector inserts.

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